S.F.L.Y. - I'll say it again, you get it.
OK, for the sake of this argument let's presume that selecting Flaps 25 was the correct decision.
Who thinks slowing by from 118 kts Flaps 25 that they're INCREASING their gliding distance by slowing to 108 kts Flaps 25???
You're going from (approx.) Vref -20 to Vref -30. That's going to INCREASE your performance???
So, if you're on the back side of the power curve(lift curve/drag curve, whatever you want to call it in pilot terms) and slowing an additional 10 kts will INCREASE your gliding performance?
Another issue is that by slowing to AOA limits there is no excess energy(ie airspeed) to try and flare. That woud allow for a slightly decreased sink rate at impact.